9th Class Chemistry Notes [Updated Edition]


Kumail Kazmi
by Kumail Kazmi
@thekumailkazmi
9th Class Chemistry Notes


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Table of contents

# Chapter
1 Fundamentals of chemistry
2 Structure of atoms
3 Periodic Table and Periodicity of Properties
4 Structure of Molecules
5 Physical states of Matter
6 Solutions
7 Electrochemistry
8 Chemical reactivity

Chapter 1: Fundamentals of chemistry

9th class chemistry notes 1st chapter

You will be able to identify and provide examples of different branches of chemistry, differentiate among branches of chemistry, distinguish between matter and a substance, define ions, molecular ions, formula units and free radicals. You will be able to describe how Avogadro's number is related to a mole of any substance, change atomic mass, molecular mass and formula mass into a gram atomic mass, gram molecular mass and gram formula mass.

Major concepts:

Chapter 2: Structure of atoms

9th class chemistry notes 2nd chapter

After studying this chapter you will be able to describe the contributions that Rutherford made to the development of the Atomic Theory, explain how Bohr's atomic theory differed, describe the structure of the atom including the location of the proton, electron and neutron. You will be able to define isotopes, compare isotopes of an atom, discuss the properties of the isotopes of H, C, Cl, U and draw the structure of different isotopes from the mass number and atomic number.

Major concepts:

Chapter 3: Periodic Table and Periodicity of Properties

9th class chemistry notes 3rd chapter

After studying this unit you will be able to distinguish between period and group in the Periodic table, state the Periodic law, classify elements (into two categories: groups and periods) according to configuration of their outemost electrons. You will also learn to determine the demarcation of the periodic table into s-block and p-block, explain the shape of the periodic table, recognize the similarly in the physical and chemical properties of elements in the same family of the elements.

Major concepts:

Chapter 4: Structure of Molecules

9th class chemistry notes 4th chapter

You will be able to find the number of valence electrons in an atom using teh Periodic Table, describe the importance of noble gas electronic configurations, state the octet and duplet rule, explain how elements attain stability, describe the ways in which bonds may be formed, state the importance of electronic configurations in formation of ion. You will also learn to recognize a compound as having ionic bonds, identify characteristics of ionic compounds.

Major concepts:

Chapter 5: Physical states of Matter

9th class chemistry notes 5th chapter

After studying this chapter you will be able to effect on the volume of a gas by a change in the a. pressure b. temperature, compare the physical states of matter with regard to intermolecular forces present between them, account for pressure-volume changes in a gas using Boyle's Law. Explain the properties of liquids like evaporation, vapour pressure, boiling point.

Major concepts:

Chapter 6: Solutions

9th class chemistry notes 6th chapter

After studying this chapter you will be able to define the terms: solution, aqueous solution, solute and solvent and give an example of each. Explain the difference between saturated, unsaturated and supersaturated solutions, use the rule that "like dissolves like" to predict the solubility of one substance in another.

Major concept:

Chapter 7: Electrochemistry

9th class chemistry notes 7th chapter

After studying this chapter you will be able to define oxidation and reduction in terms of loss or gain of oxygen or hydrogen, define oxidation and reduction in terms of loss or gain electrons, identify the oxidizing and reducing agents in a redox reaction, identify the direction of movement of cations and anions towards respective electrodes.

Major concepts:

Chapter 8: Chemical reactivity

9th class chemistry notes 8th chapter

After studying this unit you will be able to show how cation and anion are related to the terms metals and non-metals, explain Alkali metals are not found in the free state in nature, explain the differences in ionization energies of Alkali and alkaline earth metals. You will also learn to differentiate between soft and hard metals (iron sodium).

Major concepts:



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